Just so you know, all three Karkpanzers (yes, even the heavy) have been prototyped by yours truly. It was a long process, and my scheduling troubles are completely to blame. Things seem to be back on track, now, (yes, a tank pun) and I think I can go ahead and start showing you a few things.

Or, projectiles and propellant could be store separately. I remember a David Drake story where the projectiles were loaded into the breech, and then liquid propellant flooded into the chamber, and was detonated. Always thought that was neat.

Anyway, that's neither here nor there. That barrel is a placeholder. Final bore will be skinnier, but not by much.

On the other hand, when it comes to weaponry in sci-fi minis, bigger is usually better, since bigger casts more consistently, and doesn't twist and turn like a wet noodle during shipping and transport ;)